Kid, neither of the parents of the litter you mention are listed as health tested on the KC site. Testing in working lines is unfortunately not as common as in show lines. Also, show lines are generally calmer and can make better pets for that reason.
If you search through the breeders (ones whos dogs have current health tests are 'starred', which makes it easier to find them.
Breeders should:
-have health tested both parents
-have puppies checked over by a vet before they leave, or at the very least encourage you to take puppy to your vet within 2 days of taking it home to be checked.
-have wormed puppies regularly, preferably, but not essentially frontlined them
-weaned puppies onto good quality food (premium brand, not Bakers, Pedigree etc IMHO)
-rear puppies indoors and have socialised puppies as much as possible within the home and preferably at least one trip out
-KC register the pups and provide a 5 generation pedigree
-have a sales contract
-insist that if you can no longer keep the pup at any time in it's life, you return it to or at least contact the breeder.
-want to stay in touch with you/keep up with pups progress
-provide a puppy pack with the puppy, which might just include information, but would ideally include at least a small supply of the food the puppy has been on. (I also include 'The Perfect Puppy' by Gwen Bailey and also 'Book of the Bitch' for bitch puppy buyers, and also toys etc)
-be available for you to ring for any 'after sales' advice or if you run into any problems with your puppy or just have a general query.
You shouldn't be 'impressed' by any of the above, it is the bare minumum standard I would expect any decent breeder to adhere to. What I have written above is the minimum you should expect.
If you join the forum on Champdogs, there are a lot of good breeders who can advis eyou and you can 'advertise' in the 'wanted' section.